Pneumatic vulcanizing-core



A. o. ALSTEN.., PNEUMATIC VULCANIZING CORE. APPLICATION FILED MAY 3, 1916.

.Patented Jam. (S, 1920.

.ALFRED O. .ALLSTEN,.OF WORCESTER, MASSACHUSETTS. f

PNEUMATIC VULQANIZING-CORE.

Specification of Letters Patent.

Application filed May 3, 1916. 4Serial No. 95,221.

To all ywhom t may concern:

- Be it known that I, ALFRED OfALsTEN, a subject of the King of Sweden, residing at Ilforcestei', in the county of lVorcester and State o f Massachusetts, have' y,invented a new and useful .Pneumatic Vulcanizing- Core, of which the following is a speciication.

This invention relatesto a core for use in' vulcanizin-g tires forv repairing purposes. Heretofore these cores have been made in three forms. A softbag made of rubber,4

and consequently readily destructible and never very durable, has been used alone, orA

such a bag or tube has been used in connection with, an outer tube, of non-eXpansible material, usually frictioned duck or the like for the purpose of protecting the inner tube during the vuleanizing process. The third way is to use the outer tube alone, but that is open to the objection that it is not eX- pansible so that no adequate pressure can be provided on the inside surface of the tire being repaired. The single inner tube has been objectionable on account of its lack of durability, while the double bag has been objectionable because the inner tube is likely to blow out and get injured and-spoil the repairing operation.

The principal object of this invention is to provide a single .tube which although eX-l pansible will not be formed of the readily destructible pure rubber gum, but can be made of durable heavy fiict'ioned material.

Reference is to be had'to the accompanying drawings in which- Figure 1 is a perspective view of a single tube pneumatic core constructed in accordance with this invention;

Fig. 2 is a' transverse sectional view ofthe saine at the center showing it in its non-eX- panded condition;

Fig. 3 is a similar view showing it in its expanded condition in a vulcanizing mold,

and

Figs. 4 and 5 are transverse sections of a modification.

The pneumatic coie is shown in the drawings in the forni of a single tube A com posed of one or more layers of frictioned duck or other rubberizedfabric lined with rubber which is flexible but not materially eXpansible and which will stand the degree of heat necessary for repeated vulcanization.

It. is preferably formed of `the usually used for the'outer tube. It con- Patented Jan. 6, i920.

sists of a single tube closed at all points exl cept that at the end it Li'eceives a supply tube B through which it" is inflated in any ordinary way. j A

For the purpose of rendering expansible this core, which as has been stated is formed of non-eXpansible material. it is provided with a longitudinal depression a preferably along the concave side thereof. This depression is formed in t-heinolding operation and its walls are composed' also ofv frictioned duck or other rubberized text-ile ina- 'terial so that it, itself, is not expansible,

but it is preferred to make it `more flexible than the rest of the walls of the core. For this purpose it is shown somewhat thinner and having .a higher percentage of rubber, but care is taken that it shall not be expansible. y i Although the bag made as so fai` described will accomplish the purposes :of this invention by itself I prefer to provide a solid hard core C in the depression or groove a preferably filling the same when the bag is de flated and formed of wood, gutta percha, or the like. 4 Over this I prefer to place a strip D which can be secured at. its ends 0r' one of them to the end of the core A. This strip can be formed of frictioned duck or other desired material, and is designed for form-4 ing the/core walls at the inner or upper part ,of that mold as' shown in Fig. 3.

In, the use of the device the core with 90` theseparts in position and entirely deflated is introduced into the mold 4inside of the outer tube E to be repaired. When the terior surface of the tire being vulcanized. In this way all the advantages of the ordinary pure rubber single tube bag are retained and also the advantages of the more durable outer tube. The objectrof the core C will now be seen. ItI is simply to hold the,

In this lway thel bag, entirely of substantially isexpanded and the pressure of air is transmitted to the in-` i mold is all ready air is pumped into it and.

strip I) up against the inside of the tube and enable it to shape the inner surfaces of' the concave side, but it can'be dispensed with under certain circumstances if desired, The above description applies specifically to the preferred constructionv shown in .the

In Figs. 4 and 51 have irst three gures.

` when inflated.

snown aforin vin which-the groove e is V- shaped and its flat sides are stiff'ened by rigid' pieces of gutta percha, wood, or other material a2. In this case no core' as C is needed but strip D is used. The parts move from the condition shown in Fig. 4L to that shown in Ii`ig. 5 upon inflation, and the results are similar .to those above specified. v Although I have illustrated and described only two embodiments of the invention I am aware of the fact that other modifications can be made therein by any person skilledin the art without departing from the scope of the invention as expressed iii the claims.

Therefore I donot wish to be limited to all the details of construction herein shown and described, but what'I do claim is v:-

l. As an article of manufacture, 'a single tube pneumatic vulcanizing core formed of substantially non-expaiisible material having 'a hinge-like connection longitudinally thereof to permit bodily expansion thereof.

2.- As an article of manufacture, a single tube pneumatic. vulcanizing core formed entirely of substantially non-expansible but flexiblematerial and having means whereby when inflated its diameter will be increased, said means embodying a flexible joint extending longitudinally of the tube-v whereby tlie tube may be bodily expanded notwithstanding the fact that it is made of non-expansible material.

i 3. As an article of manufacture, a pneumatic v ulcanizing core' formed mainly of flexible rubberized textile material and provided with a groove or depression whenL deflated capable of straightening oit in a ltransverse direction so as to allow the diameter of the bag to increase when inflated.

V4. As an article of manufacture, a pneumatic vulcanizing core comprising flexible frictioned material and provided with a groove or depression located longitudinally and' extending substantially the Whole length of the bag on the concave side'capable of straightening out in a transverse direction so as to 'increase the diameter of the bag 5. Asan article of manufacture, a pneumatic vulcanizing corev formed of substantially non-expansible but flexible material and provided with agroove or depression when deflated capable of straightening out 1n a transverse direction so as to increase the diameter of the bag when inflated, the

walls of said groove being formed of nonexpansible material of a more flexible character than the main walls of the bag.

6. As an article of manufacture, a pneumatic vulcaniziiig Core formed of substantially non-expansible but flexible material.k

and provided with a groove or 'depression when deflated `capable of straightening out in a transverse direction so as to increase the diameter of thev bagivhen inflated, and

a vcore normally lying in said groove butl separate frin the bag.

As an article of manufacture, a pneumatic vulcanizing core formed of' substantially non-expansible but flexible material.

and provided. jwith a groove or depression-- covering said core and the groove and supported by the core for engaging the interior of the tire being vulcanized. i

' 8. As an article of manufacture, a pneu- I matic vulcanizing core formed of substantially non-expansiblc but flexible material. and provided with a groove or depression when deflated capable of straightening out in a transverse direc-tien so as to increase the diameter of the bag when inflated, and a strip of material covering said groove both in its expanded and non-expanded condition to engage the interior of the tire to be vulcanized. v

9. As an article of manufacture, a single, tubepneumatie' vulcanizing core formed of substantially non-stretchable material but capable of body expansion by reason of the.

provision of a flexible joint' ruiming longitudinally along the concave side of the core anda strip extending longitudinally along the core and bridgin 0' said joint and adapted to bear against the inner faces of the side walls of the tire when the tube is inflated, for the purpose set forth.

In testimony whereof I have hereunto set my hand.

ALFRED o. ALsTEN.' 

